package middleware

import (
	"log"
	"net/http"
	"runtime/debug"
	"time"
)

// Logger middleware для логирования HTTP запросов
func Logger(next http.Handler) http.Handler {
	return http.HandlerFunc(func(w http.ResponseWriter, r *http.Request) {
		start := time.Now()

		// Обертка для захвата статус кода
		wrapped := &responseWriter{ResponseWriter: w, statusCode: http.StatusOK}

		next.ServeHTTP(wrapped, r)

		log.Printf(
			"%s %s %d %s",
			r.Method,
			r.RequestURI,
			wrapped.statusCode,
			time.Since(start),
		)
	})
}

// responseWriter обертка для захвата статус кода
type responseWriter struct {
	http.ResponseWriter
	statusCode int
}

func (rw *responseWriter) WriteHeader(code int) {
	rw.statusCode = code
	rw.ResponseWriter.WriteHeader(code)
}

// Recovery middleware для восстановления после паник
func Recovery(next http.Handler) http.Handler {
	return http.HandlerFunc(func(w http.ResponseWriter, r *http.Request) {
		defer func() {
			if err := recover(); err != nil {
				log.Printf("panic: %v\n%s", err, debug.Stack())
				http.Error(w, "internal server error", http.StatusInternalServerError)
			}
		}()

		next.ServeHTTP(w, r)
	})
}

// CORS middleware для настройки CORS заголовков
func CORS(allowedOrigins []string) func(http.Handler) http.Handler {
	return func(next http.Handler) http.Handler {
		return http.HandlerFunc(func(w http.ResponseWriter, r *http.Request) {
			origin := r.Header.Get("Origin")

			// Проверка разрешенных источников
			allowed := false
			for _, allowedOrigin := range allowedOrigins {
				if allowedOrigin == "*" || allowedOrigin == origin {
					allowed = true
					break
				}
			}

			if allowed {
				w.Header().Set("Access-Control-Allow-Origin", origin)
				w.Header().Set("Access-Control-Allow-Methods", "GET, POST, PUT, DELETE, PATCH, OPTIONS")
				w.Header().Set("Access-Control-Allow-Headers", "Content-Type, Authorization")
				w.Header().Set("Access-Control-Max-Age", "86400")
			}

			// Обработка preflight запросов
			if r.Method == http.MethodOptions {
				w.WriteHeader(http.StatusNoContent)
				return
			}

			next.ServeHTTP(w, r)
		})
	}
}

// ContentTypeJSON устанавливает Content-Type: application/json
func ContentTypeJSON(next http.Handler) http.Handler {
	return http.HandlerFunc(func(w http.ResponseWriter, r *http.Request) {
		w.Header().Set("Content-Type", "application/json; charset=utf-8")
		next.ServeHTTP(w, r)
	})
}